linux-kernel - Re: [PATCH] netfilter: per netns nf_conntrack

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Message-ID: <4B6967BC.600@trash.net>
Date:	Wed, 03 Feb 2010 13:10:36 +0100
From:	Patrick McHardy <kaber@...sh.net>
To:	Jon Masters <jonathan@...masters.org>
CC:	Alexey Dobriyan <adobriyan@...il.com>,
	Eric Dumazet <eric.dumazet@...il.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	netdev <netdev@...r.kernel.org>,
	netfilter-devel <netfilter-devel@...r.kernel.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: Re: [PATCH] netfilter: per netns nf_conntrack_cachep

Patrick McHardy wrote:
> Jon Masters wrote:
>> On Tue, 2010-02-02 at 19:58 +0200, Alexey Dobriyan wrote:
>>
>>> Yes, moving to init_net-only function is fine.
>> So moving the "setup up fake conntrack" bits to init_init_net from
>> init_net still results in the panic, which means that the use count
>> really is dropping to zero and we really are trying to free it when
>> using multiple namespaces. Per ns is probably an easier way to go.
> 
> Agreed, that will also avoid problems in the future with the
> ct_net pointer pointing to &init_net. I'll take care of this
> tommorrow.

Unfortunately a per-namespace conntrack is not easily possible without
larger changes (most of which are already queued in nf-next-2.6.git
though). So for now I just moved the untrack handling to the init_net
setup and cleanup functions and we can try to fix the remainder in
2.6.34.

Jon, could you give this patch a try please?

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